Z8523320ASG

Specialized Overview

The Z85233 is an Enhanced Mono Serial Communication Controller (EMSCC) from Zilog, functioning as a single-channel variant of the Z85230 ESCC. It supports full-duplex data communications with software compatibility to the SCC family. The device features a 4-byte transmit FIFO and an 8-byte receive FIFO to reduce CPU overhead. It operates at clock frequencies up to 16 MHz with a supply voltage range of 4.5 V to 5.5 V. Available in PQFP and PLCC packages, it includes hardware interface simplifications such as relaxed databus setup times.

Specialized Feature Summary

• Integrated FIFO buffers for improved packet handling and reduced processor intervention
• Automatic SDLC frame management including flag transmission and abort handling
• Simplified CPU hardware interface with software-generated interrupt acknowledge support

Specialized Applications

• High-performance serial communication systems requiring protocol flexibility
• SDLC network controller implementations
• Embedded systems needing efficient data transfer with minimal CPU load

Specialized Procurement Notes

Verify package type availability, as the component is offered in both PQFP and PLCC configurations. Confirm operating temperature ranges against specific environmental requirements. Ensure power supply stability within the specified 4.5 V to 5.5 V limits during operation. Check for end-of-life status or discontinuation notices prior to finalizing procurement plans.

Specialized Selection Notes

Select this controller when a single-channel solution is sufficient, avoiding the complexity of dual-channel devices like the Z85230. Consider the PQFP or PLCC package based on board space constraints. Evaluate system timing requirements against the 10 MHz and 16 MHz specifications to ensure compatibility with the host microprocessor bus speed.

Specialized Part Context

The Z85233 belongs to Zilog's SCC family introduced in 1981, utilizing Superintegration Technology. It serves as the mono-channel counterpart to the Z85230 ESCC, offering similar functionality with enhanced FIFO capabilities. This lineage ensures backward compatibility with existing SCC designs while providing modern performance improvements.

Specialized Replacement Considerations

The Z85230 ESCC is the dual-channel equivalent. For direct pin-compatible replacements, verify if the additional channel of the Z85230 is acceptable. No other specific substitute part numbers are documented in the provided source material.